Arethusa and Areithous spent around three months at Camp Half Blood. Finally, the mysterious Percy Jackson, one of their brothers, came to Camp Half Blood. He arrived while Arethusa was sparring with a son of Ares, who had the power of telumkinesis - he could manipulate weapons. Which was why whenever Arethusa threw a knife or a needle or something at him, even shooting arrows, it was batted away, flying towards her instead. So she had ditched the weapons part, calling up a huge wall of water and a miniature hurricane to attack him.
He was currently trying to keep a wall of shields up to keep the hurricane away, but what he had forgotten was that she could manipulate more than just one hurricane or storm, she wasn't just a mere demigod, like Perseus Jackson. Also, she cold apparate, though that had a CRACK! Misting by dissolving ito water and appearing at another place was silent. Misting behing him, she used a wave of water to knock him down, and onother wave to surf around him. She then jumped down and tackled him. She had a knife at his throat, and she was smirking down at him. "Do you surrender?" she asked. Looking at the knife, he managed a yes. Vanishing all of the water and storms and collecting her weapons, she picked up her brother and swung him around.
"Well, Aro, that's another win for me. I believe you were saying that you wanted lunch?" Areithous nodded. "Yeah Sissy! I want lunch!" She laughed. "Well, then let's go get some." They walked to the dining pavilion, unaware that Perseus Jackson had been watching them. Sitting at the Poseidon table, the demigod joined them a moment later. "Hi," said the boy. Arethusa nodded warily. "Hello. Who are you? If you lie, then you shall find yourself at the point of my sword in a moment." The boy shrugged. "I'm Percy Jackson, son of Poseidon, and nobody is able to beat me. I'm the best swordsman in two hundred years."
Arethusa nodded, smirking. "I'm Arethusa Potter, daughter of Poseidon/Neptune and un unknown goddess, second in line for the throne of Atlantis, and this is Areithous Potter, son of Poseidon/Neptune, fourth in line for the throne of Poseidon. And I have fought hundreds of battles - I highly doubt that you could beat me. How about after lunch, we spar, swords only, no powers or other weapons allowed." Percy nodded, grinning. "Sure. The two of you stay in the Poseidon cabin, right?" Arethusa looked at him. "No, Perseus, we do not. We stay in my pesonal cabin, which I built years ago and moved here with magic."
Percy laughed and Arethusa glared at him. He quickly stopped his laughter. "What?" he asked, "You can't be serious?" Arethusa only glared harder. "I assure you Perseus," she said, "That I am indeed serious." Lunch passed quickly, Areithous eating as much as he could, Percy eating even more, and Arethusa eating only a little bit. Percy noticed and asked her about it. "Hey Arethusa, why are you eating like, nothing?" Arethusa glared. "Mortal food does not sustain me, I need ambrosia and nectar." Percy just shrugged. "Oh well, more for me and the little dude here."
Arethusa glared. "Do not call him that, his name is Areithous, that is what his mother named him." Percy looked at her. "Why so protective of him? And isn't his mother yours? I mean, you're both Potter." Arethusa sighed. "No. His mother is my Aunt." Percy looked at Arethusa. "Well then where is your mom?" Arethusa glared even harder. "Technically, in the mortal world, I am an orphan - I have two mortal parents and two immortal parents - my mortal parents are dead. They have been dead for fourteen years." Percy winced."Ooh, I'm sorry. Then who did you grow up with? Your aunt that's Areuthous' brother?"
Arethusa shook her head. "Sadly, no. I grew up with my aunt, uncle, and cousin on my mother's side. I was abused. Now, if that's all, let's spar." Percy shrugged, standig up and cramming a cookie into his mouth, washing it down with blue coke. Arethusa sneered in disgust, thugh the sneer turned into a smile as she looked down at her younger (and favorite) brother. "Come on Aro," she said, "You can watch me beat this boy." Percy protested. "Hey! I'm a man, and you don't even know if you wil beat me yet. I'm pretty sure that I will beat you!" Arethusa just rolled her eyes. Areithous smiled. "Sure!" he chirped happily, taking three cookies and a goblet of mil with him as a snack to watch his sister and her 'enemy' battle.
In the arena, Arethusa discarded all of her weapons and armor, except for her sword. Percy however, put on a set of armor and uncapped his pen, which turned into a sword. He looked at Arethusa, sword hanging lazily at his side. "Go," he said. In a flash, Arethusa was in front of him, knocking the sword out of his hand, pushing him to the ground, and holding her sword at his throat. "Did you beat me?" She asked. "Are you going to surrender?"
He looked up at her, "No, I didn't beat you, and yes, I'll surrender, but you cheated!" Arethusa scoffed. "And how exactly did I cheat?" He struggled for an answer before finally coming up with, "I wasn't ready!" Arethusa shook her head, climbing off of him. "You're the one who said go, idiot." Percy jumped up, red coating his face, neck, and ears. "But it-it still wasn't fair!" Arethusa collected her armor and weapons, putting the armor on and weapons in their places. Picking Areithous up and setting him on her shoulders, she walking off, calling over her shoulder. "I won fair and square, you're just a sore loser!"